For the track, try to avoid to mix different thread wear, tires brand. They won't react the same to temperature and won't grip/loose grip at the same time.

But this is the case with the same tire anyway, isn't it? Front and rear dynamics are quite different. My main concern is tramlining. Reason I ask is I want 255 in front and the only tire I can find in that size is RE-11. Then NT05 on rear because they're cheaper.

You get to the point where you get different slip angles, sure...the tires heat up differently weather it be inside tire, outside tire...front/rear.

But, if you get different tire, now you play with different sidewall deflections and slip angles. For example, RS3s require huge amounts of slip angle to get maximum grip, where as the Star Specs do not. With this, you will not satisfy the front w/out disrupting the rear...and vice versus